Sumner, John A. <br/><br/>
An introduction to heat pumps 
John A.Sumner 
 - Dorset:  Prism,  1980.  
 - 64p. ; 
<br/><br/> PB 
<br/><br/><br/>Eng  
<br/><br/><label>ISBN: </label>0907061001 
<br/><br/><label>Dewey Class. No.: </label>621.4025  / SUI